According to script...
(16,mtef_visitor_source,af_castle_lord,0,1,[]),
(17,mtef_visitor_source,af_castle_lord,0,1,[]),
(18,mtef_visitor_source,af_castle_lord,0,1,[]),
(19,mtef_visitor_source,af_castle_lord,0,1,[]),
(20,mtef_visitor_source,af_castle_lord,0,1,[]),
(21,mtef_visitor_source,af_castle_lord,0,1,[]),
(22,mtef_visitor_source,af_castle_lord,0,1,[]),
(23,mtef_visitor_source,af_castle_lord,0,1,[]),
(24,mtef_visitor_source,af_castle_lord,0,1,[]),
(25,mtef_visitor_source,af_castle_lord,0,1,[]),
(26,mtef_visitor_source,af_castle_lord,0,1,[]),
(27,mtef_visitor_source,af_castle_lord,0,1,[]),
(28,mtef_visitor_source,af_castle_lord,0,1,[]),
(29,mtef_visitor_source,af_castle_lord,0,1,[]),
(30,mtef_visitor_source,af_castle_lord,0,1,[]),
(31,mtef_visitor_source,af_castle_lord,0,1,[])
Only these Entry Points inside a castle are used for Lords and Ladies. So even if you add more Entry points with Edit Mode you still need to edit the script. So you can't get more lords in any castle without a mod.